Citation

USDA 1997: United States Department of Agriculture, Agricultural Research Service, National Genetic Resources Program. Germplasm Resources Information Network (GRIN). Scrophularia nodosa L.; Last updated: 26-Mar-1997. National Germplasm Resources Laboratory, Beltsville (MD). [Accessed 2011-01-25]. Available from: http://www.ars-grin.gov/cgi-bin/npgs/html/tax_search.pl